1. Open the glove box.
2. Inside the glove box, there is a small pull-tab on the left side.
3. Pull the tab to release the fuse box cover.
4. Remove the fuse box cover to expose the fuses.
5. The fuse for the air filter is usually labeled as "Air Filter" or "Engine Control."
6. Check the fuse to see if it is blown. If it is blown, replace it with a new fuse of the same amperage.
Note: The location of the fuse box and the labeling of the fuses may vary depending on the year and model of your Mercedes Benz E350. If you cannot find the air filter fuse, consult the owner's manual or contact a qualified mechanic for assistance.